发明名称 |
Apparatus and method for providing multiple video data streams from a single source |
摘要 |
A method is provided for generating a composite video data stream. A first data stream composed of a sequence of frames of video data each having an x-dimension of a preselected number of pixels and a y-dimension of a preselected number of pixels is received. A second data stream composed of a sequence of frames of video data each having a x-dimension of a preselected number of pixels and a y-dimension of a preselected number of pixels is also received. The x- and y-dimensions of the frames of the first data stream are downscaled to produce a sequence of first blocks of pixels. The x- and y-dimensions of the frames of the second data stream are downscaled to produce a sequence of second blocks of pixels. The first blocks are written into a first object buffer associated with a first memory space during first and third ones of four processing phases using a set of counters associated with the first object buffer. The second blocks of data are stored in a second object buffer associated with a second memory space during first, second, third and fourth ones of the four processing phases using a set of counters associated with the second object buffer. A pair of blocks each composed of one of the first and one of the second blocks are retrieved out of a third object buffer associated with both the first and second memory spaces during ones of the first, second, third and fourth processing phases using a set of counters associated with the third object buffer. Each pair of blocks are then output as a field of the composite video data stream.
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申请公布号 |
US5543842(A) |
申请公布日期 |
1996.08.06 |
申请号 |
US19950474262 |
申请日期 |
1995.06.07 |
申请人 |
CIRRUS LOGIC, INC. |
发明人 |
XU, FRANK;NALLY, ROBERT M. |
分类号 |
H04N5/92;H04N7/08;(IPC1-7):H04N7/08 |
主分类号 |
H04N5/92 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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